Parallelize clean rules using GNU make features

* Makefile.in: (submake_template): New definition.
(mostlyclean_dirs, clean_dirs, distclean_dirs, maintainer_clean_dirs):
New variables.
(mostlyclean, clean, distclean, bootstrap-clean, maintainer-clean)
(extraclean): Define using each subdirectory as a prequisite.

* lib/Makefile.am (bootstrap-clean):
* doc/emacs/Makefile.in (bootstrap-clean):
* doc/lispintro/Makefile.in (bootstrap-clean):
* doc/lispref/Makefile.in (bootstrap-clean):
* doc/misc/Makefile.in (bootstrap-clean):
* lib-src/Makefile.in (bootstrap-clean):
* lwlib/Makefile.in (bootstrap-clean):
* nextstep/Makefile.in (bootstrap-clean):
* nt/Makefile.in (bootstrap-clean):
* oldXMenu/Makefile.in (bootstrap-clean):
New rules, for symmetry/simplicity.

* lwlib/Makefile.in (mostlyclean, clean, distclean, maintainer-clean):
* oldXMenu/Makefile.in (mostlyclean, clean, distclean, maintainer-clean, tags):
Declare as PHONY.

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/misc/Makefile.in b/doc/misc/Makefile.in
index 9e036c43ad4..d191534c2de 100644
--- a/doc/misc/Makefile.in
+++ b/doc/misc/Makefile.in
@@ -209,7 +209,7 @@ ${buildinfodir}/tramp.info tramp.html: EXTRA_OPTS = -D emacs
 ${buildinfodir}/tramp.info tramp.html: ${srcdir}/trampver.texi
 
 
-.PHONY: mostlyclean clean distclean maintainer-clean
+.PHONY: mostlyclean clean distclean bootstrap-clean maintainer-clean
 
 mostlyclean:
 	rm -f *.aux *.log *.toc *.c[mp] *.c[mp]s *.fn *.fns \
@@ -235,7 +235,7 @@ infoclean:
 	    $(buildinfodir)/$${file}-[1-9][0-9]; \
 	done
 
-maintainer-clean: distclean infoclean
+bootstrap-clean maintainer-clean: distclean infoclean
 
 dist:
 	rm -rf emacs-misc-${version}